MoS2-encapsulated nitrogen-doped carbon bowls for highly efficient and selective removal of copper ions from wastewater

Capacitive deionization has been considered as a promising wastewater treatment technology because of its low-cost and highly efficient. Herein, we prepared hollow bowl-type carbon materials loaded with molybdenum sulfide (HBC-MoS 2 ) composites and fabricated it as an innovative electrode material to remove Cu 2+ in a multi-ion coexistence system. With the synergistic effect of electric double layer (EDL) and complexation between MoS 2 and Cu 2+ , the HBC-MoS 2 -0.02 electrode achieved effective removal of copper ions from low concentration wastewater (25 mg/L) and high electrosorption capacity of 28.97 mg g −1 at 1.0 V. Even in the presence of competing ions (Na + /Zn 2+ /Cu 2+ ), the HBC-MoS 2 -0.02 electrode still can effectively remove Cu 2+ with a final adsorption capacity of 28 mg g −1 , showing its superiority. The mechanism of Cu 2+ removal by HBC-MoS 2 is mainly due to the synergistic effect of EDL and complexation.